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arXiv 2106.03055gr-qcastro-ph.HE
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克尔黑洞对引力波的放大

Amplification of gravitational wave by a Kerr black hole

Yi Gong, Zhoujian Cao, Xian Chen

摘要:

双黑洞可能在超大质量黑洞附近形成。背景黑洞(BH)会影响双星黑洞产生的引力波(GW)。众所周知,彭罗斯过程可以提供额外的能量,由于能层。本文研究了Kerr黑洞背景对引力波的能量放大。特别是与以前的研究不同,我们比较了在有和没有附近的克尔BH的情况下波的能量。我们发现,只有当双黑洞相对于Kerr背景运动时,GW能量才能被放大。否则,能量将被背景克尔黑洞所抑制。这一发现与Wald对Penrose过程发现的不等式是一致的。考虑到现实的天体物理场景,我们发现克尔黑洞背景可以放大GW能量最多5倍。

英文摘要:

Binary black hole may form near a supermassive black hole. The background black hole (BH) will affect the gravitational wave (GW) generated by the binary black hole. It is well known that the Penrose process may provide extra energy due to the ergosphere. In the present paper we investigate the energy amplification of the gravitational wave by a Kerr black hole background. In particular and different from the earlier studies, we compare the energies of the waves in the cases with and without a nearby Kerr BH. We find that only when the binary black hole is moving relative to the Kerr background can the GW energy be amplified. Otherwise, the energy will be suppressed by the background Kerr black hole. This finding is consistent with the inequality found by Wald for Penrose process. Taking into account realistic astrophysical scenarios, we find that the Kerr black hole background can amplify the GW energy by at most 5 times.

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